Repair problem K2700

Do I have a Kia K2700 that is repaired and changed block and when it does not rise lubrication to the cylinder head and engine oil enters the refrigeration water and the oil ends emulsified that can be?

Before repair there was no mixture of fluids

If it carries oil cooler, the problem can come if this is perforated there in the two circuits, especially that of the water, you do not tell us if when changing the block they put accessories from the old to the new block plane; It would be good to comment why the block was changed in case it had a relationship with the problem. Greetings!!